Tracking F-region plasma depletion bands using GPS-TEC, incoherent scatter radar, and all-sky imaging at Arecibo

Şeker, Ilgın; Livneh, D. J.; Makela, J. J.; Mathews, J. D.

doi:10.1186/bf03353127

Cited by 11 publications

(31 citation statements)

References 37 publications

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“…COFIs were also observed at Arecibo via an airglow imaging camera. For further discussion relating the Arecibo airglow imager observations to the COFIs observed with the ISR, please see the study by Livneh et al [2007] and Seker et al [2008]. Notice the increase of apparent vertical wavelength with height that is usually taken as being characteristic of thermospheric AGWs.…”

Section: Observationsmentioning

confidence: 99%

“…Because of space constraints, only a portion of the results is shown in this paper; please contact the author for the remaining images. For the high‐resolution 22 March 2004 and 5 June 2005 Arecibo results, please see Figures 2 and 3 of Livneh et al [2007] and Seker et al [2008].…”

Section: Observationsmentioning

confidence: 99%

“…While the link between the COFIs discussed here and the moving depletions seen in the imager is confined only to optically suitable nighttime hours they provide our only concurrent horizontal glimpse of the phenomenon. Using PSASI, Seker et al [2008] give these COFIs as observed on 22–23 March 2004 at Arecibo tentative a horizontal wavelength of ∼150 km, and horizontal phase velocities of ∼150 km/hour to the southwest. Garcia et al [2000] also observed MSTIDs in airglow images from Arecibo and give speeds of 50 to 170 m/s and horizontal wavelengths of 50 to 500 km.…”

Section: Introductionmentioning

confidence: 99%

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Omnipresent vertically coherent fluctuations in the ionosphere with a possible worldwide‐midlatitude extent

et al. 2009

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Incoherent Scatter Radar power profile observations at Arecibo, Millstone Hill, and the Poker Flat AMISR have revealed the continuous presence of Coherent Omnipresent Fluctuations in the Ionosphere (COFIs) with periods ranging from roughly 30 to 60 minutes and apparent vertical wavelengths increasing with altitude from tens to hundreds of kilometers. Upon high‐pass filtering of the Incoherent Scatter Radar power profile and electron concentration data, the COFIs are seen unambiguously and ubiquitously in Arecibo results from 22–23 March 2004, 5–6 June, 21–25 September, and 17–20 November 2005, as well as Millstone Hill results from 4 October to 4 November 2002. The COFIs are strong throughout the F region, often spanning altitudes of 160 km to above 500 km, and are detected day and night in the F2 layer. In fact, the COFIs are seen at every time and altitude that there is sufficient plasma to detect them. The COFIs are also observed at Poker Flat, although the poor signal‐to‐noise ratio over segments of the data makes it difficult to determine whether or not they are always present. The consistent detection of the COFIs, along with the longitudinal alignment and large latitudinal spread of the observation sites, suggests that these waves are always present over at least North America. This phenomenon appears to have been reported in Total Electron Concentration (TEC) maps of the ionosphere over much of North America Tsugawa et al. (2007b) as well as in airglow images from Arecibo and many other midlatitude sites around the world. These observations give us insight into the horizontal properties of the waves. While Medium‐Scale Ionospheric Disturbances (MSTIDs) are generally associated with aurorally generated acoustic gravity waves, the properties of the COFIs may suggest otherwise. We present other possible source mechanisms, notably a possible link to oscillations in the solar wind and magnetosphere. We have observed consistent fluctuations with periods of about an hour observed in magnetic field measurements taken at geosynchronous altitudes by the Geostationary Operational Environmental Satellites (GOES)‐10 and ‐12 satellites, which may be linked to the COFIs. We give corresponding solar wind results from ACE and discuss possible coupling mechanisms.

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Section: Observationsmentioning

confidence: 99%

Section: Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Omnipresent vertically coherent fluctuations in the ionosphere with a possible worldwide‐midlatitude extent

et al. 2009

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“…Finally, and perhaps most importantly, it has been tentatively found that, at midlatitudes, the MSTIDs usually occur during geomagnetically quiet times [Saito et al, 2002;Shiokawa et al, 2003;Kotake et al, 2006;Tsugawa et al, 2007a;Candido et al, 2008;He and Ping, 2008;Seker et al, 2008] whereas the plumes usually occur at midlatitudes when the geomagnetic activity is high [Garcia et al, 2000;Sahai et al, 2000;Seker et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

Relation between magnetospheric state parameters and the occurrence of plasma depletion events in the nighttime midlatitudeFregion

2011

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[1] Studies using all-sky imagers have revealed the presence of various ionospheric irregularities in the nighttime midlatitude F region. The most prevalent and well known of these are the medium-scale traveling ionospheric disturbances (MSTIDs) that usually occur when the geomagnetic activity is low and midlatitude spread F plumes that are often observed when the geomagnetic activity is high. The inverse and direct relations between geomagnetic activity and the occurrence rate of MSTIDs and midlatitude plumes, respectively, have been observed by several studies using different instruments; however, most of them focus on MSTIDs only and use only Kp to characterize geomagnetic activity. In order to understand the underlying causes of these two relations and to distinguish between MSTIDs and plumes, it is illuminating to better characterize the occurrence of MSTIDs and plumes using multiple magnetospheric state parameters. Here we statistically compare multiple geomagnetic driver and response parameters (such as Kp, AE, Dst, and solar wind parameters) with the occurrence rates of nighttime MSTIDs and plumes observed using an all-sky imager at Arecibo Observatory (AO) between 2003 and 2008. We also present seasonal and annual variations of MSTIDs and plumes at AO. The results not only allow us to better distinguish MSTIDs and plumes, but also to shed further light on the generation mechanism and electrodynamics of these two different phenomena occurring at nighttime in the midlatitude F region.Citation: Seker, I., S. F. Fung, and J. D. Mathews (2011), Relation between magnetospheric state parameters and the occurrence of plasma depletion events in the nighttime midlatitude F region,

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“…Otsuka et al (2013) simulated the density structure of MSTID and found the different morphologies for the daytime and nighttime MSTIDs. Although the mechanism of MSTID is still not yet clear, the daytime MSTID might be caused by a gravity wave, while the nighttime MSTID might be generated by the electrodynamical coupling between the Es layer and F region (Shiokawa et al 2003;Saito et al 2007;Otsuka et al 2007;Seker et al 2008;Yokoyama et al 2009). If the MSTID is produced by the electrodynamical coupling effect, a field-aligned structure of density should be observed because the electric field prefers to transport along the magnetic field.…”

Section: Discussionmentioning

confidence: 99%

Medium-scale traveling ionospheric disturbances by three-dimensional ionospheric GPS tomography

et al. 2016

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In this study, we develop a three-dimensional ionospheric tomography with the ground-based global position system (GPS) total electron content observations. Because of the geometric limitation of GPS observation path, it is difficult to solve the ill-posed inverse problem for the ionospheric electron density. Different from methods given by pervious studies, we consider an algorithm combining the least-square method with a constraint condition, in which the gradient of electron density tends to be smooth in the horizontal direction and steep in the vicinity of the ionospheric F2 peak. This algorithm is designed to be independent of any ionospheric or plasmaspheric electron density models as the initial condition. An observation system simulation experiment method is applied to evaluate the performance of the GPS ionospheric tomography in detecting ionospheric electron density perturbation at the scale size of around 200 km in wavelength, such as the medium-scale traveling ionospheric disturbances.

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Tracking F-region plasma depletion bands using GPS-TEC, incoherent scatter radar, and all-sky imaging at Arecibo

Cited by 11 publications

References 37 publications

Omnipresent vertically coherent fluctuations in the ionosphere with a possible worldwide‐midlatitude extent

Omnipresent vertically coherent fluctuations in the ionosphere with a possible worldwide‐midlatitude extent

Relation between magnetospheric state parameters and the occurrence of plasma depletion events in the nighttime midlatitudeFregion

Medium-scale traveling ionospheric disturbances by three-dimensional ionospheric GPS tomography

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